- Category: Water Feature
- Type: Bay
- Latitude/Longitude: 53°16'40"N 4°37'14"W
- Eastings/Northings: 225374, 378870
- OS Grid: SH253788
- Mapcode Local: GBR GNZ1.67T
- Mapcode Global: WH42H.0V0W
Location and coordinates are for the approximate centre of Trearddur Bay within this administrative area.
Geographic features and populated places may cross administrative borders.